This work was conducted in the agricultural years 2003/2004 and 2004/2005, at the "Três Marcos" Farm, Uberlândia (MG), Brazil. It was aimed to evaluate the effect of crop residues [coverage sorghum (hybrid Cober Exp), forage millet (var. BN2), finger millet (Eleusine coracana) and St. Lucia Grass (Brachiaria brizantha)] in two amounts: 3.0 and 5.5 t ha-1 in the first year and 3.5 and 5.8 t ha-1, in the second year, combined with residual herbicides: diclosulam at 35 g ha-1 and imazaquin at 140 g ha-1, applied at pre-emergence, on the development of soybean under `Cerrado' field, conditions. In the first year, after the soybean field was installed, Eleusine coracana became the major weed species in the finger millet plot. Because this species was not controlled by herbicides, its presence negatively influenced soybean development. The herbicide imazaquin indirectly affected soybean plants, due to its inefficient weed control. Soybean plants grown under St. Lucia Grass (both years) and finger millet (second year) reached higher grain yield, mass accumulation and height. Sorghum residues affected soybean development in both years. The amount of residues, had difference between them for forage millet (first year) and sorghum (second year). The small amounts of forage millet and major of sorghum caused injury in soybean plants.
cerrado; mulch; chemical control; integrated management; weed; no-tillage system
